To find the source of any flickr image, look at the image file name (assuming it hasn't been changed). It should be a string of numbers, followed by an underscore, and then a string of numbers/letters, like this:
Code:
You are not allowed to view this content until you register.
Take the numbers to the left of the underscore and append them to this:
Code:
You are not allowed to view this content until you register.
So you get this:
Code:
You are not allowed to view this content until you register.
That's the URL for the original flickr post, and from there you can see the rest of their photos.